Fix answer file download on presale order info page

src/pretix/presale/views/order.py

@@ -1154,7 +1154,11 @@ class AnswerDownload(EventViewMixin, OrderDetailMixin, View):
         answid = kwargs.get('answer')
         token = request.GET.get('token', '')
 
-        answer = get_object_or_404(QuestionAnswer, orderposition__order=self.order, id=answid)
+        answer = get_object_or_404(
+            QuestionAnswer,
+            Q(orderposition__order=self.order) | Q(order=self.order),
+            id=answid,
+        )
         if not answer.file:
             raise Http404()
         if not check_token(request, answer, token):
@@ -1164,7 +1168,7 @@ class AnswerDownload(EventViewMixin, OrderDetailMixin, View):
         resp = FileResponse(answer.file, content_type=ftype or 'application/binary')
         resp['Content-Disposition'] = 'attachment; filename="{}-{}-{}-{}"'.format(
             self.request.event.slug.upper(), self.order.code,
-            answer.orderposition.positionid,
+            answer.orderposition.positionid if answer.orderposition else '',
             os.path.basename(answer.file.name).split('.', 1)[1]
         )
         return resp